<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Hello Spring MVC</title>
</head>
<body>


<form action="calc.do" method="post">
	A: <input type="text" name="a"/> <br/>
	B: <input type="text" name="b"/> <br/>
	<input type="submit" name="action" value="+"/>
	<input type="submit" name="action" value="-"/>
	<input type="submit" name="action" value="*"/>
	<input type="submit" name="action" value="/"/>
</form>

<%

	Double value = (Double) request.getAttribute("result");

 	if(value!=null){
 		
%>
	Result: <input type="text" value="<%=value%>"/>
<%
 	}

%>

</body>
</html>